x402

Verified

Open payment protocol for agentic and API-based machine-to-machine commerce.

3.7

Open sourceAI Agents

Pricing

Open source

About x402

x402 is an open protocol for enabling HTTP-native payments, agent payments, and API commerce. It is relevant to developers building monetized APIs, autonomous agents, and pay-per-use services.

Key Features

HTTP 402 payment standard implementation
Agent-to-agent micropayments
Open protocol for agent commerce
Supports multiple payment rails
Developer SDK and documentation

Pros & Cons

Pros

+ Solves real problem of agent payments

+ Open standard — not locked to any platform

+ Growing ecosystem adoption

Cons

- Very early stage technology

- Requires crypto/blockchain knowledge

- Limited real-world adoption so far

Use Cases

Agent-to-agent paymentsMonetizing AI skills and dataBuilding agent marketplacesMicropayment infrastructure